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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5e338ff05e6dee4d4f1c40682639c151a8d298ac571207aa8955c361345f2f2' 
  AND token = 'YpPTRIk74Z3s4s7Fi2FrXdKxbScbwf+Z9/C0j0Stg1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}